namespace TUnit.TestProject.Bugs._3684;

public class Class1Tests
{
    public class Constructor : Class1Tests
    {
        [Test]
        public void AddendIsNull_ThrowsArgumentNullException()
        {
            // Test implementation
        }
    }

    public class AddAddend : Class1Tests
    {
        [Test]
        public void ValidInput_ReturnsSum()
        {
            // Test implementation
        }
    }
}
